MINE DETAILS
SILVER BELL MINING LLC
MSHA MINE ID0200134
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- SILVER BELL MINING LLC32.39056, -111.21667Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-18. MSHA quarterly production and employment reports.
Coal production
0reported short tons
Hours worked
634,661reported employee hours
Tons per hour
0.00production ÷ hours worked
Missing values appear as —. Totals use available reports. Tons per hour requires production and hours for the same quarters and a nonzero hours total. * Striped bars mark partial mine coverage or an incomplete quarter. See the table for coverage.
Quarterly data and reporting coverage
| Quarter | Coal (short tons) | Hours worked | Tons / hour | Avg. employees | Coverage |
|---|---|---|---|---|---|
| 2025 Q1 | 0 | 103,493 | 0.00 | 205 | 1/1 mines reporting |
| 2025 Q2 | 0 | 107,003 | 0.00 | 215 | 1/1 mines reporting |
| 2025 Q3 | 0 | 109,927 | 0.00 | 205 | 1/1 mines reporting |
| 2025 Q4 | 0 | 101,370 | 0.00 | 207 | 1/1 mines reporting |
| 2026 Q1 | 0 | 104,267 | 0.00 | 205 | 1/1 mines reporting |
| 2026 Q2 | 0 | 108,601 | 0.00 | 208 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-18
Violations
142 significant & substantial (S&S)
Accident records
80 records classified as fatality
Proposed penalties · USD
10,304.0013 of 14 violations with amounts
On-site inspection hours
137.2511 inspections · 11 with hours
Counts are published records, including contractor records. * The quarter was incomplete at the snapshot date; recent counts may rise as reports arrive. — means no reported amount or hours. Portfolio totals use current membership.
Quarterly safety data
| Quarter | Violations | S&S | Proposed USD | Accident records | Fatality records | Inspections | On-site hours |
|---|---|---|---|---|---|---|---|
| 2025-Q1 | 0 | 0 | — | 1 | 0 | 1 | 1.0 |
| 2025-Q2 | 0 | 0 | — | 3 | 0 | 1 | 10.8 |
| 2025-Q3 | 3 | 0 | 569.00 | 1 | 0 | 1 | 25.0 |
| 2025-Q4 | 0 | 0 | — | 0 | 0 | 1 | 2.8 |
| 2026-Q1 | 5 | 1 | 7,544.00 | 1 | 0 | 3 | 40.8 |
| 2026-Q2 | 0 | 0 | — | 1 | 0 | 1 | 1.5 |
| 2026-Q3 | 6 | 1 | 2,191.00 | 1 | 0 | 2 | 55.5 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 1 | 0.0 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
56.14207 · $151.00 proposed
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee was picking up a 5-gallon bucket of ore one handed when they felt a pop and pain in right shoulder
SLIP OR FALL OF PERSON · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
Employee was walking in the tie down area around the water truck, when they slipped and landed on their right wrist, resulting in a fracture. Employee was placed on restricted duty.
SLIP OR FALL OF PERSON · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee lost EE's footing and stumbled causing EE to lacerate EE's head on a steel window frame of a connex box. Employee received 6 Staples
SLIP OR FALL OF PERSON · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
Employee was walking in a dim area when EE tripped and fell over forks from a forklift, resulting in right shoulder pain. On 4/22/2025, employee was placed on Restrictive Duty
103 (g) Written Notification Hazard Complaint Inspectio · 10.8 on-site hours
Non-Chargeable Accident Investigation · 1.0 on-site hours
MACHINERY · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee was using 1 inch impact gun on bolt under truck. Bolt was not coming off causing the employee to adjust position. As employee was adjusting the impact gun it bounced back hitting employees face causing a small chip top of *R* tooth. 4/10/25 EE did elect to repair tooth, dental work completed
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-18.
Counts describe published rows, including contractor records; accident records are not distinct incidents or numbers of people injured.
Zero means no matching records in the imported sources, not proof of no events. Historical coverage differs by source; absence before a source begins reporting is not a zero incident rate. Invalid or absent dates and records after the snapshot are excluded.
S&S means SIG_SUB=Y. Fatality records use DEGREE_INJURY_CD=01. Proposed penalties are not final assessed or paid amounts; missing dollar values are omitted.
Inspection hours are SUM_TOTAL_ON_SITE_HOURS attributed to the inspection start date, without supervisor/trainee hours. Missing hours are omitted; a started inspection may still be open.
Portfolio totals use current mine membership, including events before the current owner or operator's tenure.
CFR headings link to the current Title 30 index; they are not historical legal determinations.
OWNERSHIP
Operator and controller history
Current ownership comes from MSHA Mines. Historical start and end dates come from MSHA Controller and Operator History.
—
Grupo Mexico S A B de C VcontrolsASARCO LLC, a Delaware Limited Liability CompanyoperatesSILVER BELL MINING LLC
msha-controller-operator-history · controller/operator co-tenure derived on mine 0200134—
Asarco InccontrolsSilver Bell Mining LlcoperatesSILVER BELL MINING LLC
msha-controller-operator-history · controller/operator co-tenure derived on mine 0200134Other historical summaries · source-specific periods
RECORD SUMMARY
Production, safety and enforcement
These summaries use the periods stated on each card, independently of the reporting period above.
01 / SAFETYwatch
Accidents and injuries
185 historical accident/injury rows; 0 coded fatalities and 3,310 lost days across the published record.
ACCIDENT + INJURY RECORD24 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
447 violation rows across the full record; 77 carry an S&S flag and $181,056 appears in current assessed amounts.
ENFORCEMENT ACTIVITY44 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHcontext
Occupational health samples
91 personal; 6 area. 0 personal-sample rows have a published C/E ratio above 1; 0 noise rows have an action-level or PEL dose above 100%. These are separate measures, not a silica exceedance count. Silica results and sample status are shown separately.
OCCUPATIONAL EXPOSURE97 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
109K employee hours and 208 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
44 contested-violation rows, 46 civil-penalty docket/decision rows, and 21 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE111 linked rows
conferencescontested-violationscivil-penalty-dockets-decisions06 / CONTRACTORScontext
Contractors
Contractors are linked through this mine’s violation or accident records. Their production and hours cover all their operations, so they are not included in this mine’s totals.
ENTITY-LEVEL CONTEXT21 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
116 inspection events and 5K published inspection hours across the historical record.
OVERSIGHT COVERAGE28 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 18, 2026. 18 silica records across the mine’s published history.
Personal silica samples · concentration / limit
Quarterly mean · published C/E ratio
— No eligible measurements. * Quarter in progress. Means describe the available samples, not average exposure across the mine.
Quartz % is the sample’s quartz content; µg/m³ is its reported concentration. Personal C/E is the ratio to the limit published with that sample. Personal and area concentration units and void status are not specified in those source files.
| Date / sample | Dataset / analyte | Occupation / area | Measurement | Sample status | Published action |
|---|---|---|---|---|---|
| No silica records match these filters. Missing samples do not establish safe conditions. | |||||
Sources and interpretation
- Coal means use numeric concentrations from samples marked not voided, excluding control/invalid sample types and dates after the snapshot. Missing values remain null; reported zeroes remain zero.
- Quarterly means describe available samples, not mine-wide or worker-average exposure. Quarters with no eligible measurements remain empty; the current quarter is partial.
- Personal C/E is MSHA's published concentration-to-limit ratio. A value above 1 is not by itself a citation or a determination under the 2024 silica rule. Personal and area files do not publish a void-status field.
- Area records include bulk-dust analyses and are kept separate from personal exposure results. Their concentration units are not specified in the source dictionary.
- Missing samples do not establish safe conditions. Coal quartz percentage and concentration are separate measures. No compliance threshold is inferred for coal samples.
Coal quartz field definitions ↗Metal/nonmetal personal field definitions ↗Metal/nonmetal area field definitions ↗
EIA + TITLE 30
EIA production and cited regulations
EIA annual figures are reported separately from MSHA. Regulation links use the current eCFR snapshot.
Not present in the 2024 EIA coal workbook.
This can mean the operation is non-coal, inactive for the annual period, or outside the EIA-7A reporting population.
30 CFR 56.14101Brakes.1 recent row ↗30 CFR 56.12004Electrical conductors.3 recent rows ↗30 CFR 56.23002Written safety program.1 recent row ↗30 CFR 56.23003Requirements for written safety program.1 recent row ↗30 CFR 56.11001Safe access.1 recent row ↗30 CFR 50.30Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.1 recent row ↗30 CFR 56.12018Identification of power switches.1 recent row ↗30 CFR 48.27Training of miners assigned to a task in which they have had no previous experience; minimum courses of instruction.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
522125356.14101(a)(2)S&S
522125256.12004Citation
522125156.12004Citation
515183356.23002(b)Citation
515183256.23003(b)Citation
515183156.11001Citation
503698550.30(a)Citation
503090156.12018Citation
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgTruck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgTruck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgFlotation/Concentrator Oper.
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgFlotation/Concentrator Oper.
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgFlotation/Concentrator Oper.
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgFlotation/Concentrator Oper.
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgTruck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgBulldozer Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors185Mar 31, 2000—Jul 28, 2026mine-keyed
Addresses of Recordidentity · logistics1Feb 24, 2026—Feb 24, 2026mine-keyed
Assessed Violationscompliance · legal444Mar 30, 2000—Aug 23, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal46Feb 27, 2002—Nov 25, 2024mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal21Nov 2, 2000—Oct 12, 2021mine-keyed
Contested Violationscompliance · legal44Mar 1, 2007—Feb 18, 2026mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety4,094Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety825Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance2Jan 1, 1950—Mar 1, 2000mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance318Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance81Not published—Not publishedmine-keyed
Inspectionssafety · compliance116Mar 27, 2000—Oct 6, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety6Mar 11, 2004—Dec 22, 2010mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety91Mar 11, 2004—Apr 2, 2025mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal447Mar 30, 2000—Aug 23, 2026mine-keyed
107(a) Orders Issuedsafety · compliance—No published rowsabsent / not applicable
NOTES
Limitations
- Contractor production is entity-level and is never represented as mine-attributable.
- Missing rows can mean no event, publication delay, identity mismatch, or inapplicability.